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| 0001558370-23-007254.txt | 2023-04-28 16:02:37 | |
 0001558370-23-007254-xbrl.zip | 396834 | 2023-04-28 16:02:37 |
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| imgn-20230331xex31d1.htm | 10920 | 2023-04-28 16:02:37 |
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| imgn-20230331xex32.htm | 10062 | 2023-04-28 16:02:37 |
| imgn-20230331_cal.xml | 34660 | 2023-04-28 16:02:37 |
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| report.css | 2767 | 2023-04-28 16:02:37 |
| Show.js | 1085 | 2023-04-28 16:02:37 |